17 Kasım 2021 Merkez (Düzce) Depremi (Mw5.0) ve Artçı Şoklarının (Mw4.3 ve Mw3.9) Moment Tensör Çözümleri ve Ana Şok Coulomb Gerilme Analizi

Abstract

Bu çalışmada 17 Kasım 2021 tarihinde yerel saat ile (YS) 15.40’da meydana gelen Mw5.0 büyüklüğündeki Merkez (Düzce) depremi ile Mw4.3 (YS 15.57) ve Mw3.9 (YS 21.35) büyüklüklerindeki iki artçı şokun kaynak mekanizma çözümleri moment tensör ters çözüm (MT) yöntemiyle bulunmuştur. Ana şokun KD-GB uzanımlı doğrultu atımlı kırık üzerinde meydana geldiği tespit edilmiştir. Bu çalışmada elde edilen ana şok moment tensör çözümü, deprem veri merkezlerinden elde edilen fay çözümleri ile karşılaştırılmış ve bulunan sonucun uyumlu olduğu görülmüştür. Mw4.3 büyüklüğündeki artçı şokun kaynak mekanizmasının doğrultu atım bileşeni olan ters faylanma mekanizmasına, Mw3.9 büyüklüğündeki artçı şokun ise KD-GB uzanımlı doğrultu atımlı faylanma mekanizmasına sahip olduğu görülmüştür. Ana şokun neden olduğu Coulomb gerilme değişimi hesaplanmış ve K-G, KB-GD ve KD-GB yönlerinde kesitler alınarak yaklaşık 15 km derinlikteki gerilmenin değişimi incelenmiştir. Buna göre, Merkez (Düzce) depreminin ana şok ve artçı şoklarının bölgedeki KD-GB yönündeki gerilmeyi azalttığı, buna karşın K-G ve BKB-DGD yönündeki yakın faylar üzerine maksimum 1 bar gerilme yüklediği tespit edilmiştir. Gerilmenin arttığına işaret edilen bölgede 23 Kasım 2022 Gölyaka (Düzce) depremi (Mw5.9) meydana gelmiştir. Bu durum, çalışmadaki sonuçların doğruluğunu kanıtlamaktadır.

Keywords

• Düzce Depremleri
• Coulomb Gerilme Analizi
• Moment Tensör Çözümü

Moment Tensor Solutions of November 17, 2021 Central (Duzce) Earthquake (Mw5.0) and its Aftershocks (Mw4.3 and Mw3.9) and Coulomb Stress Analysis of the Mainshock

Abstract

In this study, the source mechanism solutions of the November 17, 2021 Central (Düzce) earthquake occurred at 15.40 local time (LT) with magnitude Mw5.0 and its aftershocks occurred with magnitudes Mw4.3 (LT 15.57) and Mw3.9 (LT 21.35) were found by using the moment tensor inversion (MT) method. It was determined that the mainshock occurred on the NE-SW oriented strike-slip fracture. The mainshock source parameter solution obtained in this study was compared with the fault solution obtained from earthquake data centers and it was seen that the result was compatible. It was observed that the source mechanism of the Mw4.3 aftershock was reverse faulting with a strike-slip component, and the Mw3.9 aftershock has a NE-SW oriented strike-slip faulting mechanism. The Coulomb stress variation caused by the mainshock was calculated and the variation of the stress at a depth of 15 km was examined by taking cross-sections in N-S, NW-SE and NE-SW directions. Accordingly, it was determined that the mainshock and its aftershocks reduced the stress in the NE-SW direction, but loaded maximum of 1 bar on the nearby faults in the N-S and WNW-ESE directions. 23 November 2022 Gölyaka (Düzce) earthquake (Mw5.9) occurred in the region where the stress was indicated to increase. This proves the accuracy of the results in the study.

Keywords

• Duzce Earthquakes
• Coulomb Stress Analysis
• Moment Tensor Solution

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